Internal metal lap.



L. S. RASMUSEN & H. B. CARLSON.

INTERNAL METAL LAP. I APPLlCATlON FVILED' FEB. 28, ms.

Patented Feb. 6,1917.

' INVENTORS LOBENGE s. Rasmussen, on noon issues, innin'ois, shin I navansenn sows..-

eras

one cn.

HEEIEAR B. GABLSON, OF

INTERBSIAL Fluid.

arms-summons To all whom it may concern."

Be it known ehat 'we, LGRENCE S. Rae

MUSEN and Hessian B. Cnnnson a citizenof the United States and a subject of the King of Sweden,' respectively, residing at Rock Island, in the county ofliock island and State of Illinois, and Davenport, in the county of Scott and State of lows, respectively, have invented certain new and useful Improvements in Internal Metal Laps; and We dohe'reby declare the following to be a full, clear, and exact description of the inyention, such as will enable others skilled in'the art to which it appertains to make and use the same. I This invention relates to grinding and polishing, and more especially to the in ternal treatment. of curved surfaces; and the object of the same istoproduce an. improved lap or tool which. is intended to be rapidly rotated within a tubular piece of work so as to-applf] the ahrading material thereto. A.

further object is to so construct the lap that it will adapt itself to work of slightly varying sizes and to inequalities on the surface I i being treated.

. These objects are carried out by the con struction hereinafter more fully described and claimed, and shown in the drawings Wherein- Figure l is a plan View of this improved lap, Fig. 2 is a longitudinal section on. the line A -A of Fig. 1, Figs. 3 and L are trans-- verse sections on the lines BB and G k. respectively of Figs. land 2, and Fig. 5 is a longitudinalsectional View showing modifi cations or amplifications.

In conunon practice iniernal laps are mounted at one end in lathe or drill. press and rapidlyrotated, and the tubular piece of work to be treated is slipped over thelap and moved along the same so that all parts ofits-interior are treated. Often the Work is slightly irregular or rough, and itbe- "comes desirable to have the lap yield slightly to accommodate itself to'these i-r-- regularities. Also a tubular piece oi? work is sometimes initially produced in a size slightly larger or slightly smaller than standard, and it is the purpose of our invention to cause this lap to adapt itself to these variations. We ought say that in Fig and 2 suchnicans for adaptation are shown only one end of the tool whereas in Fig.

they are shown at both ends thereof, and. ii;

Specification oi insiders Fsteizc.

Application filed February 213, 1916. iicriei 3%. 81,607.

Patented see. c. 1917.

is our intention to cover both constructions or eifaher. L

Referring now to the drawings by reference numerals, l is thetuioular body of this improved tool, its ends 2 and 3 being un-- broken. and'that: portion between said ends: being provided with longitudinal slots 8 whereof three are shown in Figs. 3 and 4. This body is by preference made of metal and its outer face is truly cylindrical and formed with a working surface 7 which grinds and polishes the interior of the tubular piece of work to be treated. The bore l is cylindrical and of considerable size near both ends of the body as best seen in Fig. 2, but toward the center of the length of said body said bore is tapered or reduced so as to form conical seats 5, and the apexes of these seats are connecied by reduced or,

very fine bore 6 around which the Wall of the tubular body is somewhat thicker than elsewhere as shown. it follows that' the ends of this tubular body at 2 aind 3 cannot expand or contract, but on account of the slots 8 its intermediate portion may do so. A. strictly cylindrical piece oftubular work slipped over either end and along she body would contacawith the working surface 7 throughout the length of the tool, but if the work were a trifle larger than either unbroken end the working surface would have to be expanded or enlarged slightly in order to bring it into contact with the surface to be treated.

The expander or spreader is shown in 2 a plug 10 having a conical point 11 which fits into one of the seats 5, the rear or outer end of the plug here having, a pin i2. The unbroken end. 2 is shown as having threaded bore or opening 14" into which passes a. screw 16 having a pin,15 at its inner end. ii. coiled spring 17 is, located within the bore l between said screw and plug, and its extremities engaged by the pinsv 12 and 15, The normal expansive force' of this spring tends to urge the spreader forward or inward against the seat 5 and distend the center of the body so as to enlarge the working surface 7, and it lSgOb- YIlOllS that adjustment of'the screw would increase or decrease ihe tension of the spring.

While we llLYQSllOWII the element 16 as a screw in Fig. 2, any adjustable plug would instead of a pin, and the s ring 17 is cup ppld e as at 18 so as to embrace t e'spreader.

latter in this case is a ball 13 whoserear side is seated within the cup and whose'front or inner' 2side is seated within the conical seat 5, but'it is obvious that the action is the same as above described. This view (Fig. 5)

- use'Tof to illustrate the fact that spreaders could be employed inboth ends of the bore 4' and work on'both the seats 5, and it will be understood without further illustration and description that the two Spreaders could be alike or could differ as shown.

The plug within the other unbroken end 3 of the body is by preference smooth as shown at 20, although in fact it niight be possible here also to use a screw. This plug is-useful more especially for preventinglcrushing of this end of the tubular body w en the same is clamped within .a lathe or between jaws as shown at J J and, as one spreader .will distend the center of the body and increase the size of 'the working surface 7, it is not in all cases necessary and indeed it is sometimes not desirable that thisplug shall also be used in connection with a spreader. However, in Fig. 5 we have shown such .a spreader at'Ql having a pin 22, and the plug 20 as having a pin 25, and between these two elements a coiled spring 27 is disposed so that it normally bears the spreader forward and forces its conical point into the seat 5.

When the plug 20 is pressed inward to increase the tension on this s ring, it must be held in that position by c amping the tool within some member as indicated at J J and when this member is rotated the entire tool is rotated in the manner first above described. If a screw be used in place of the plu 20, the head of the screw should be sma ler than the circumference of'this end of the tool in order that the entire screw may be passed into the machine or betweenthe jaws which will be clamped upon it, and the clamping action while preventing the outward slipping of the plug will obviously revent the unscrewing of the screw. It willalso be obvious without further illustration that the spreader may have a point which is of the same taper as the conical seat or of a different taper, or it may have a rounded point or a hemispherical point or faced like the inner side of the ball 13. The idea is that when this spreader is pushed inward against the seat, the slotted and therefore yielding center of the body is spread or expandedyet this expansive force is itself a yielding one by reason of the presence of the spring, and if the work has also been madeshould cause the compression or reduction in size of the working surface of the tool the seat would react on the spreader and push the latter backward against the force of the spring so that nothing would be broken. In use, as is well known, the tool is inserted in some rotary member here indicated at J J andmapidly rotated. The tubular work is then brought into position in' the hands of the operator and passed over the free end'of the tool, and pushed up and down upon the same so that the working surface or expanded center of the tool is moved into contact with all portions of the interior of drawn and the screw 16 set up a little so that I the spring 17 is put under greater tension and the plug 10 forced forward. This expands the center of the tool, and when the work is replaced thereon the working surface 7 is aJittle larger. The abrading ma- .terial being. applied, either to the exterior of the tool the'interior of the work, when now the tool is rotated rapidly as described, the bore of the work is treated in the manner desired. If the work to be treated is a ring whose bore is of less length than the length of the tool shown, the action is the same excepting that the ring passes completely over the tool and the outer end of the latter is exposed; and in this case the workman can observe What is occurring more easily than ifthe work were, for instance, a gun barrel.

What we claim is: 1. A tubular lap unbroken at its ends, its

' exterior being normally cylindrical throughout its length, and yielding means tending to spread the portion between said ends so as to enlarge the surface thereof.

2. An internal lap having between its ends an active surface which normally substantially cylindrical, and yielding means tending to distort the shape of said lap between its ends and enlarge the circumference of said surface without enlarging it at said ends.

3. A lap internally cylindrical and externally cylindrical and normally of one size throughout its length, and yielding means movable longitudinally within the lap and tending to enlarge the sizc'of the same between its ends.

4. A tubular lap unbroken at its ends and longitudinally slotted between them, its exmally An internal lap longitudinally slotted between its ends and hollow throughout its portion having a norsurface, a spreader within said hollow portion for ehslotted portion, said cylindrical working larging the "body of the lap where. itvis slotted, and yielding means for advancing said spreader but permitting its rebession.

,6.'An internal lap longitudinally slotted between its ends and hollow throughout its slotted portion, said mally cylindrical working hollow portion forenlarging the body of the lap ;where it "is slotted, aspring for advancing said spreader but permitting its recession and means for adjusting the tension of said spring.

- 7. An internal lap slotted portion, its bore having a tapering seat opposite said face, having its inner end engagingsaid seat, and yielding means bearing against 'its outer end and tending to advancethe spreaderand enlarge said working'face while permitting the recession of the s reader as described.

8 A lap slotted a ong its working face and tubular opposite the slotted portion, its bore having a tapering seat opposite said face, a spreader within said bore having its inner end engaging said seat, a plug ad ustably mounted in the adjacent end of the lap,

and an expansive lap, and an expansive screw and spreader.

member and spring between said plug and spreader. f e.

9. A tubular lap slotted alongits working face, its bore having a taperin seat opposite said face, a spreader within said bore having its inner end engaging said seat, a screw threaded-into theadjacent end of the spring between the 10. A lap slotted alongrits working face and tubular opposite the slottedportion, its in size opposite said spreader consisting of a mounted in said bore and having a taper ng pointengaging said seat, a longitudinally adjustable member in theadjacent end of the la'p,-an expansive s ring between the member and spreader, a d means on such the spring.

portion having a norsurface, a

along its work-' ing face and tubularopposite the slotted a spreader within said bore plug slidably thea educed portion of the spreader engaging the ends of; tures.

broken and whose intermediate portion is longitudinally slotted, its bore at-its d--- length, beingtapred to form two concal seats; of a spreader'resting against one seat,

a screw in theadjacent end of the bore, an

expansive spring in such bore between the screw and spreader, and a smooth plug .in the other end of the bore.

12. In, an internal lap, the combination with a tubular body whose ends-are unbroken and whose intermediate portion is length being tapered to form two conical seats of "a spreader resting agaii'ist one seat,

longitudinally slotted, its, bore at its mida screw in theadjacent end of the bore, an

expansive spring i'n-such bore between the screw and spreader, a spreader nesting against the other seat, an adjustable member in this end of the bore, and anexpan'sive spring between this member and the gidjw cent spreader. 1

13. In an internal lap, he'combination with a tubularv body whose 'ends' are unbroken. and whose intermediate portion is"- longitudinally slotted, itsbore at its length being tapered to. form two conical seats; of a spreader resting a screw in the adjacent end of the bore, an expansive spring in suclrbor between the screw and spreader, a spreader restin against the other seat, a smooth plu longitudinally adjustable in this end of tfie, bore, and an expansive spring between the inner end of said plug and the'adjacent spreader. 14. In an internal la'p,. the' combination with a tubular body unbroken at both ends and longitudinally slotted between them, its bore being taperedin opposite directions at its mid-length to form two conical seats, smooth from one Seat outward through one end, and smooth from the otherseat outward'toward the other= I through the unbrokenp'ortion of the latter, of a screw in said threaded portion ,of the bore, a longitudinally movable plug'in the" opposite end of the'bore, expansive boiled against one seatf- 16o end and threaded springs in the bore next inside the-screw and i P springs, each comprising -a body movably ,mountedin the-bore and a tapered point,

resting on. said conical seats, the contiguousextremities of said points being separated by bore, as and for theipurpo'se set forth. l Y

testimony .whereof we aflix our signaj LoRENci-ns; ,nasMusnn; 1 HERMAN B. GARLSON;

lug, and spreaders at the inner ends of the 

